How do i tell if i have a blood clot in my leg? my leg itches and is warm. there is a little pain, but not much. no veins visible.

See doctor: To be sure, you need an ultrasound of the leg which is non-invasive and fairly quick. Some of the signs of a clot are if it's warm, red, or swollen.

Venous Doppler: A venous duplex ultrasound is the gold standard to diagnose DVT from the groin to the lower calf. See a vein specialist for a venous evaluation and venous duplex examination.